acosh man page on FreeBSD

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```ACOSH(3)		 BSD Library Functions Manual		      ACOSH(3)

NAME
acosh, acoshf — inverse hyperbolic cosine functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
acosh(double x);

float
acoshf(float x);

DESCRIPTION
The acosh() and the acoshf() functions compute the inverse hyperbolic
cosine of the real argument x.  For a discussion of error due to round‐
off, see math(3).

RETURN VALUES
The acosh() and the acoshf() functions return the inverse hyperbolic
cosine of x.  If the argument is less than 1, acosh() raises an invalid
exception and returns an NaN.

asinh(3), atanh(3), exp(3), fenv(3), math(3)

HISTORY
The acosh() function appeared in 4.3BSD.

BSD			       January 14, 2005				   BSD
```
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